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Posted to commits@cassandra.apache.org by "Anton Lebedevich (JIRA)" <ji...@apache.org> on 2015/07/02 18:56:06 UTC

[jira] [Created] (CASSANDRA-9713) 'insert ... if not exists' allows to insert the same key twice

Anton Lebedevich created CASSANDRA-9713:
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             Summary: 'insert ... if not exists' allows to insert the same key twice
                 Key: CASSANDRA-9713
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9713
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: centos 6.6 server, java version "1.8.0_45", cassandra 2.1.7,
3 machines, keyspace with replication factor 3
            Reporter: Anton Lebedevich


Application does 'insert ... if not exists' with consistency level quorum into table and expects to receive 'applied' only once for the same key. 
Under normal conditions that expectation holds but it fails when cassandra cluster is being restarted one by one.
Restart scenario is:  kill -9 one node, wait 6 seconds, start it back, wait till it becomes available, wait 40 seconds (during that time all 3 nodes are up), repeat with the next node.
The problem was observed on 2.1.4, upgrading to 2.1.7 didn't change the behaviour



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